| 单词 | planula |
| 例句 | I told them about jellyfish life cycles—that jellies start off almost like a plant, clinging to the bottom of the sea, and how in that phase of life, they are a planula. The Thing About Jellyfish 2015-09-22T00:00:00Z Both gametes are produced by the polyp, which can fuse to give rise to a free-swimming planula larva. Fundamentals of Biology 2015-01-01T00:00:00Z As another illustration I may take the Magosphæra planula, discovered by Haeckel on the coast of Norway. On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z The eggs are not always laid in the condition of the simple planula described above. Seaside Studies in Natural History Marine Animals of Massachusetts Bay. Radiates. 2011-03-07T03:00:13.343Z The Norwegian Magosphaera planula, swimming about by means of the lashes or cilia at its surface. The Evolution of Man — Volume 2 Some said that the original embryonic form of the metazoa was not the gastrula, but the "planula"—a double-walled vesicle with closed cavity and without mouth-aperture; the latter was supposed to pierce through gradually. The Evolution of Man — Volume 1 After fertilization, the zygote develops into a blastula, which develops into a planula larva. Fundamentals of Biology 2015-01-01T00:00:00Z The zygote divides and grows into a planula larva, which looks like a swimming millipede. Fundamentals of Biology 2015-01-01T00:00:00Z The planula larva anchors itself to the sea bottom and grows into a tube-shaped polyp. Fundamentals of Biology 2015-01-01T00:00:00Z Section of Magosphaera planula, showing how the pear-shaped cells in the centre of the gelatinous ball are connected by a fibrous process. The Evolution of Man — Volume 2 |
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